CMake on MSYS2 freezes up - c++

Question

I'm running MSYS2 on Windows 8, and having problems with CMake freezing / locking up.
Here's a minimal example:
main.cpp:
#include <iostream>
int main()
{
std::cout << "Hello World!" << std::endl;
return 0;
}
CMakeLists.txt:
cmake_minimum_required(VERSION 3.0.0)
project (helloworld)
add_executable(helloworld main.cpp)
If I open the MSYS2 console, go to the directory in which both of the above files are located, and execute the command
cmake .
there is no further output and the console locks up. An empty CMakeFiles folder is created, but nothing else happens. I've tried with CMake 3.10.2 and 3.2.3 and the same happens for both versions.
Below is some straceoutput if at all of interest:
If I run the command
strace cmake .
I get different output at different times. Sometimes the final line is something like
19 4436 [main] cmake 2320 child_copy: done
Sometimes it is something like
44 239509 [main] cmake 9820 open_shared: name cygpid.10668 n 10668, shared 0xBB0000 (wanted 0x0), h 0x344, *m 6
And sometimes the end of the output is something like
20 2735480 [main] cmake 14200 kill_pgrp: killing pid 5900, pgrp 5900, p->ctty /dev/pty0, ctty /dev/pty5
24 2735504 [main] cmake 14200 sig_send: 1 = SetNamedPipeHandleState (0x358, PIPE_NOWAIT, NULL, NULL)
16 2735520 [main] cmake 14200 sig_send: sendsig 0x358, pid 5900, signal 17, its_me 0
19 2735539 [main] cmake 14200 sig_send: Not waiting for sigcomplete. its_me 0 signal 17
24 2735563 [main] cmake 14200 sig_send: returning 0x0 from sending signal 17
23 2735586 [main] cmake 14200 _pinfo::kill: 0 = _pinfo::kill (17), pid 5900, process_state 0x4C5
20 2735606 [main] cmake 14200 kill_pgrp: killing pid 15152, pgrp 15152, p->ctty /dev/pty5, ctty /dev/pty5
3486 2739092 [main] cmake 14200 sig_send: 1 = SetNamedPipeHandleState (0x3A0, PIPE_NOWAIT, NULL, NULL)
44 2739136 [main] cmake 14200 sig_send: sendsig 0x3A0, pid 15152, signal 17, its_me 0
33 2739169 [main] cmake 14200 sig_send: Not waiting for sigcomplete. its_me 0 signal 17
27 2739196 [main] cmake 14200 sig_send: returning 0x0 from sending signal 17
25 2739221 [main] cmake 14200 _pinfo::kill: 0 = _pinfo::kill (17), pid 15152, process_state 0x61
What could be the reason for these problems?
EDIT:
The output of
cmake . --trace
is as follows, before it freezes:
Running with trace output on.
d/Dropbox/Programming/Cplusplus/workspace/Testprograms/test_cmake/CMakeLists.txt(1): cmakeminimum_required(VERSION 3.0.0 )
d/Dropbox/Programming/Cplusplus/workspace/Testprograms/test_cmake/CMakeLists.txt(2): project(helloworld )
usr/share/cmake-3.10.2/Modules/CMakeDetermineSystem.cmake(36):
if(CMAKE_HOST_UNIX )
usr/share/cmake-3.10.2/Modules/CMakeDetermineSystem.cmake(37): find_program(CMAKE_UNAME uname /bin /usr/bin /usr/local/bin )
usr/share/cmake-3.10.2/Modules/CMakeDetermineSystem.cmake(38): if(CMAKE_UNAME)
usr/share/cmake-3.10.2/Modules/CMakeDetermineSystem.cmake(39): if(CMAKE_HOST_SYSTEM_NAME STREQUAL AIX )
usr/share/cmake-3.10.2/Modules/CMakeDetermineSystem.cmake(45): else()
usr/share/cmake-3.10.2/Modules/CMakeDetermineSystem.cmake(46):
exec_program(${CMAKE_UNAME1 ARGS -r OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION )

Answer 1

CMake doesn't like in tree builds. Make a separate build folder.
mkdir build
cd build
cmake ..
CMake doesn't build your programs, it only creates build files. Your next step would be.
mingw32-make
Unless you have other issues, you should be able to run your program.
Mike